[The] armies of Morgoth that had... beleaguered... the Havens of the Falas... were caught in their ruin.

The Silmarillion, Quenta Silmarillion, Ch 13, Of the Return of the Noldor

[The] havens of Brithombar and Eglarest were built anew. Behind their great walls they became fair towns and harbours with quays and piers of stone.

The Silmarillion, Quenta Silmarillion, Ch 14, Of Beleriand and its Realms

[The] Falathrim, the Elves of the Falas, who in after days had dwellings at the havens of Brithombar and Eglarest, [were] the first mariners in Middle-earth and the first makers of ships. Círdan the Shipwright was their lord.

The Silmarillion, Quenta Silmarillion, Ch 5, Of Eldamar and the Princes of the Eldalië

The Lost Road and Other Writings, HoME Vol 5, Part 2, Ch 2, The Later Annals of Valinor

[Morgoth's forces]... came down the rivers Brithon and Nenning and ravaged all the Falas, and besieged the walls of Brithombar and Eglarest. Smiths and miners and makers of fire they brought with them, and they set up great engines; and valiantly though they were resisted they broke the walls at last. Then the Havens were laid in ruin....